Typewriter



c. p. YOUNGBVERG July 17,.1'928.

TYPEWRITER File d Jan. 2,. i925 Patented July 17,1928. I UNITED STAT I "1,677,3154 Es; PATENT ()FF'ICE. I

- CON RAD D. YOUNGBERG, OF WOODSTOCK/ILLINOIS, ASSIGNOR T WOODSTOCK TYPE- WBITER COMPANY, OF WOODSTOCK, ILLINOIS, A CORPOIWPT ION OF ILLINOIS.

' r'YrEwRIrER.

Application filed January 2,1925. Serial N6. 30.

, This invention relates to the type bar action of typewritermechanism, and has for its object the provision ofmeans for actuatv ing the type bars which shall be of improved construction and operation and in which the noise incident to their operation duced to a minimum.

The invention s exemplified in the (50m: bination. and arrangement of parts shown shall be re 0 in the accompanying drawing anddescribed 1n the following specification, and it is more particularly pointed out in vthe appended claims v i In the drawing, the figure is a somewhat l5 diagrammatic' sectional view showing one embodiment of the present invention.

The inventionis shown as applied to a p'owervdriven typewriter such as that described and claimed in the application'of Otto A. Hok an'son, SerialNo. 732,615, but

it will bevun derstood-that the" invention is applicable to other forms of typewriting machines Ther numeral -l'designates a typewriter frame having amotor actuated roller 2'journa-led therein and driven by any suitable source of power. Key levers 3 are pivotally mounted at 4. The type bars-5 are pivoted at 6 on any well-known form of type bar 3 support and are arranged to engage a platen 7. The type bars are actuated by sub-levers ,8 pivoted at 9 on a cross-bar 10,'the sublevers being connected by pivots 11 to actuators 12. The actuators 12 are provided with teeth 13 ii -position to engagethe teeth'on the power rollers 2, the actuator bein held out of engagement withthe power roller by type bar and at the same time'makes 'it'posflink 18 is-an adjustable stopscrew 20' w ll arrest the pin. 16 at the end of its forward :movement at the; proper time to permit the-type on the type bar 5 to strike 1 a the paperontheplaten 7 with suflicient force 50 toinakethe required impression. A'spring- I i 21 is secured to each of the pins 16 and has its rear end "attached to an adjustment screw 22 so that theltension in the spring 21 may be' accurately,- adjusted. ,ThlS spring will operate to produce a negative acceleration inthe movement of the type bar 5' prior to fthefinal arrest of the type bar by the stop screw 20;

It will'thus be'seen that by the-action of the spring 21 and the adjustable st0p20 the movement of 'the type bar 5 may be accurately controlledso that the bar will be arrested at-the endof its movementlwith a minimum amount of shock and-noise; I

The location of the stop 20 for arresting the bar in close. proximity tot lie pivotal sup port of the. moving member reduces thev amount .ofnoise incident-to'the arrest of the sible to locate the arresting stop in. position where it may be enclosed in a sound deadene ing case shown at23. This sound deadening case may be of any suitabwruction, but preferably includes a layer l material, such as felt, and a layer 25' of an v-ide .the necessary stiffness, and support.

Sheet aluminum is suitable for this purpose. I claim j 1. -I'n'a typewriter, a movable-member, .a-

bar having a'slot extending longitudinally so i of fibrous es; inert metal, such as lead. The outer layer 26f may be of any suitable sheet met al to pro- 'thereof, a stop 'on 'said member arranged to" springs 14. The key levers 3 are provided with contact members 15' by means of which 40 the'actuators 1-2 are depressed to engage the rollers 2. This will produce movement of the sub-levers 8 and the type bars- 5. Thepower foractuating the type bars is furnished from'the power roller 2 andit is 4 only necessary to exert sufficient force on the key levers 3 to move theactuator correspending to the particular key lever dcpressed into engagement with the drive roller.

4 writer frame.

Each of the sub-levers 8 is connected by means of a pin 16 and slot 17 to a stop link 18'. The stop links 18 are mounted on 'a cross-bar 19 by means of which the links 18 may be adjusted fore and aft ofthe type- At'the' forward end of eachv sub leverfhaving a lug'there'on, .a link having a slot in which said lug travels, said li'nk 'having an adjustable stop for arresting the 1 movement of said lug in said slot, and an-ad justable spring for retarding the movement of said lug in said slot. 1. .4. Typewriting mechanism comprising a type bar, a sub-lever for actuating. said type 9' bar, a powerdrive for actuatingsaid sublever, a link having a slot therein, a lug on said sub-lever arranged to travel in said slot,- an adjustable stop for arresting the movement of said projection at the end of the travel of said type bar, a spring secured at one end to said lugfor retarding the movement of said lug prior to the arrest thereof and means for adjusting the tension of said sprin comprising an adjustment screw to whic the opposite end of said spring is attached and a mounting in which said screw is adjustably movable to and from said lug.

5. Typewriting mechanism comprising a sub-lever having a projection thereon, a

with its opposite end attached to an adjust.- ing member for'adjustably retarding the movement of the lug in said slot, and an. ad

justable stop at the outer end .of the slot in said link for arresting the movement of said I projection.

a 6. In'a typewriting machine, a platen,'a pivoted t ,pe bar, a sub-lever for actuating said ty buria stop for arresting the movement said sub-flevr when said type bar is in operative relationwith said platen, and a housing enclosing said stop and a-portion of said sub-leverto confine the sound produced by the movement of said sub-lever.

7. In a typewriting-machihe, a platen, a pivotally mounted-type bar, a pivoted sublever for actuating said type bar, a-key lever 1 for actuating said sub-lever, a movable stop 40 for adjusting said sub-le ver whemsaidtype bar is in printing relation with said ,platen, and a housing having walls of sound deadening material enclosing said stop and the portion of said sub-lever which. cooperates therewith. a

8. In a typewriter,-. a- Sound confining housing having spaced walls, and an operat-- in member extending'through said walls,

said walls having openings ofiset relatively of each other topermit the passage of said member, the member having an ofiset theretoconform to the positionjof said openings.

housing havinga Wall comprising a support layer of sheet metal,,a -vibration deadening fibrous material. a

layer of inert metal, and a third layer of In testimony whereof I havesigned my 50 I name to this specification on this 30th day of December, A. D. 1924:.

CONRAD i). YOUNGBERG.

9. In a typewriter, a sound confining 

